Flames can be seen from the air after an explosion happened at the sight of a train derailment in southern Jefferson County, just south of Louisville, Ky, Wednesday, Oct. 31, 2012. (AP Photo/The Courier-Journal, Sam Upshaw)

LOUISVILLE, Ky. (AP) -- Authorities are ordering a second round of evacuations near the site of a train derailment in Louisville as work begins to remove hazardous chemicals from some of the cars.

Officials said Monday the latest evacuation will only affect a fraction of the area included in an evacuation almost two weeks ago, that sent hundreds from their homes after a chemical fire erupted at the site.

Jody Duncan, a spokeswoman for the Louisville-Jefferson County Emergency Management Agency, says the evacuation will affect 31 homes within a half-mile radius of the derailment.

The evacuation will coincide with work starting early Tuesday to remove hydrogen fluoride and butadiene from four rail tanker cars.

Duncan says officials from Paducah & Louisville Railway will visit each home to give the residents pre-paid hotel information.

Online Public Information File

Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or fccinfo@fcc.gov.